What is the value of x in the following equation? y=3x-5 6x+3y=15

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?